Compression inner tube.



M N. c. Doss.

COMPHESSION INNER TUBE.

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.NOBLE C. DOSE, 0E ATLANTA, GEORGIA, ASSIGN'OR TO 'TI-IE JDOSS RUEEER AND TUBE COMPANY, 0E ATLANTA, GEORG-IA, A CORPORATION OE GEORG-1A.

My invention relates to improvements ini compression inner tubes for double tube tires. l

An important object 'of the invention is to lprovide a tube of the above mentioned character, the tread portion of which is so constructed that'fit will not leak'when unctured, while the inner protected portion is sufficiently elastic, so that. the inner tube will be self-adjusting totit within tire shoes or casings of slightly varying diameters. y A further object prvide'a tube ofthe above mentioned character, having the outer portion of the inateriail of its tread portion, rendered some-` what less eXtensible or less elastic, thereby insuring the proper compression of the inner side vof the tread vportion of the tube, and causing the tube to stretch or expand atthe portion thereof nearer the rim `of the wheel.

Other objects and advantages of the in-` vention will be apparent during the'course of the following description.

lln the accompanying drawings forming a part of this specification and in which like numerals. are employed to designate like parts throughout the same,

Figure l is a4 transverse sectional view through an inner tube embodying my indill tation thereof.

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vention, and

Eig. 2 is a central longitudinal sectional view through My improved inner tube is designated as 7 of readily the points 7, fro/m which thevmaterial of the tube'is reduced in thickness, providing an inner relatively thin portion S, which is highly elastic or extensible. y

The tread or thickened portion 6 is pro vided longitudinally thereof with alternately raised and depressed portions, 9 and l0, which are curved longitudinally and transversely, as shown. 'llhese alternately Specification o Letters Patent.

Application filed May 28, 1918.

portion is suitably vulcanized or by lpreventing the elastic of the invention is to` of air.

`of the invention or the same, in the plane ofv ro'v and comprises a oonirnnssron Innnn rnnn.

Serial No. 236.991.

raised and depressed portions vextend for substantially the entire width of the tread portion of the tube.

To insure'the proper compression of the inner portion of the tread portion 6 of the tube, the" outer material l2 of such tread otherwise ratentea ret. ie, iam.

treated to render the sainel tougher, less eiror relatively non-extensible, thereportionf the tread portion from substantially yielding outwardly when unfolded onentended 'to the maximum degree, upon indation. Ry

tensible,

this construction, should the inner taibe"beV slightly smaller than its tire casingV orv shoe,

the inner elastic portion 8 thereof will yield so that the inner tube will completely till the tire casing, therebyallowing tion to be vplaced underfsuitable compression.

By the provision of the alternatelyy .raised and depressed portions, the area of the tread portion of the tube, inthe plane of rotation,is increased,'fi`whereby such tread portion will lbe coanpressedywhen 'indated Should this tread portion, `while under conipression, be punctured, by a nail or the like, the puncture or opening the tread poi will at once close tti by virtue of the state of compressionpof the tread portion, thereby preventing the escape lt isto be understood that .thefform of my invention herewith shown and ldescribed is to be taken as a preferred example of the same, and that various changes'in the shape, size, and arrangement of parts may be esorted to without departing from the spirit the scope of the subjoined claims. V v

Having thus described my invention, what ll claim'is:- 1. A compression inner tube "forined entirely of elastic and compressible" rubber being free from fabric, the tubehaving'its tread portion proper thickened and pro vided with alternate raised and depressed portions, and its side portions from the tread portion proper to theinncrfportion of the tube decreasing in thickness yinwardly, said tread portion properfhaving its material treated .to render thefs'amenonentensible. a 'A Y 2. A compression inner tube formed of elastic and `compressible rubber, having its tread portion thickened and provided.withv lili.

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alternate raised and depressed portions, the outer surface of thetread portion being Vulcanizcd to render the tread portion rela-` highly elastic so that the stretch in the tube will occur entirely in these side portions.

3. A compression inner tube formed of elastic and compressible rubber, and having a tread portion provided With alternate raised and depressed portions, the outer surface of the tread portion being vulcanized to render the same relatively noneXtensible.

In testimony whereof I alii):l my signature.

NOBLE C. DOSS. 

